Tackle-block.



T. E. MADDUX. TACKLE BLOCK.

APPLICATION FILED NOV. 1. 1902.r

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PATENTED JULY 7, 1903.

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UNITED STATES Patented July 7, 1903.

THOMAS E. MADDUX, or GOLDBAE, WASHINGTON'.

TAGKLE-BLOCKL SPECIFICATION forming part of Letters Patent No. 733,239,cia-eed .my 7, 1903.

Application liled November l, 1902. Serial No. 129,664. (No model.)

To MZ whom it may concern:

Be it known that I, THOMAS E. MADDUX, a citizen of the United States,and a resident of Goldbar, in the county of Snohomish and State oflVashington, have invented a new and Improved Tackle-Block, of which thefollowing is a full, clear, and exact description.

This invention relates to single-sheave blocks, and particularly to aclass known as snatch-blocks, used to change the direction of pullingstrain of a draft-cable while hauling logs or timber overland from onepoint to another.

The object of my invention is to provide a tackle-block of the classindicated with novel details of construction that adapt it for the freereception of the tackle rope or cable at any point between the ends ofthe latter, afford a very light, strong, durable, and inexpensive blockwhich permits the sheave to be readily removed, provides a substantialremovable pintle-bolt for the support of the sheave, and adapts saidbolt to hold one of the hinged side walls of the shell of the block inclosed adjustment, but permits its convenient release as occasion mayrequire.

The invention consists in the novel ccnstruction and combination ofparts, as is hereinafter described and defined in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure l is a side view of the improved tackle-block in closedcondition. Fig. 2 is a transverse sectional view substantially on theline 2 2 in Fig. l; and Fig. 3 is a partly sectional viewof the block,showing the parts in open adjustment.

The shell of the block consists of two flat side plates or cheeks 5 5,having a substantially ovate form on their edges, as shown in Fig. l.Upon each side plate or cheek a strap G is secured by rivets, thesestraps of like form extending lengthwise of the side plates or cheeks.Two hinge-leaves (5 are formed on the upper end or head portion of eachstrap G, said hinge-leaves being spaced apart at the transverse centerof said strap for the reception of a leaf 7 on a corresponding end of ayoke-bar 7.

As shown, the yoke-bar consists of a metal block having a leaf 7 formedon each end, the thickness of said leaves adapting them to respectivelyfit between a pair of the leaves 6, as before mentioned, and be thereonpivoted by a rivet-bolt 8,' neatly fitted in central alined perforationsin each pair of jointleaves 6n and the leaf 7, which is inserted betweenthem.

At the longitudinal center of the yokebar 7 an eyebolt D isswivel-connected thereto by means of the loosely-fitted shank 9thereon,which is passed down through a perforation in the bar and held to turntherein by riveting the projecting lower end, so as to form a radialflange thereon, as shown in Fig. 2. A grooved sheave-wheel l0 isprovided, which is centrally perforated to receive the cylindrical bodyof the pivot-bolt ll.

The pivot-bolt is formed at one end with a square head l1 of suitabledimensions, and from said head extends the cylindrical body 1l, which isloosely inserted within the perforation of the sheave l0.

The bolt-body is reduced in diameter, so as to pass neatly through acentral perforation in the side plate or cheek 5 and strap 6, towardwhich said bolt projects, and to permit a free rotation of the sheave l0on the bolt-body the shoulder a, where the bolt-body isdiametrically'reduced, bears on the side plate 5, solas to afford spacebetween the head ll and said side plate sufficient in width to allow afree rotation of the sheave l0 when the bolt is held in place on saidplateand strap. The end portion of the bolt is extended beyond thestrap,through which it passes, and is threaded for the reception of anut l2, which when screwed on the bolt so as to impinge forcibly uponthe strap G serves to secure the bolt in place on the side plate orcheek 5 and strap 6.

A square orifice b is formed in the center of the strap 6 and tlie'sideplate or cheek 5a, opposite the side plate and strap, wliereon the boltis firmly secured, and said angular oriiice is so relatively positionedthat it will freely receive the head 1lil when the latter has its sidesdisposed parallel with corresponding sides of the orifice, it beingunderstood that lthe bolt-head is slightly smaller than the oritice itoccupies. A The bolt-head 1ln projects sufficiently out- IOO side of theside pla-te 5n and the strap thereon to permit the formation of aperforation c therein that is adjacent to the outer surface of the strapon the plate 5 when said strap and plate are fully folded over the headso as to dispose the plate or cheek in loose contact with the adjacentside of the sheave l0.

A pin or preferably a split key, such as 13,

y (shown in Figs. l and 3,) is passed for aportion of its length throughthe perforation c when the side plate 5 is fully folded over thebolt-head il, and then the two members of said key are spaced apart,which removably secures the key in place.

To prevent the loss of the key, a small chain la or other availableflexible connection is connected by one end to the bow end of the keyand at the opposite end is secured upon the strap 6 on the side plate5a, the chain having' sufficient length to permit the free insertion ofthevkey 13, as before explained.

In the head Il and the body of the pivotbolt l1 an oil-passage d isformed, as shown in Fig. 2, this passage enabling the free lubricationof the sheave l0 and the body of the pivot-bolt as may be necessary toinsure the free working of the sheave on the pivot and also between thesides of the wheel and plates or cheeks 5 5,

It will be seen that the application of the snatch-block upon adraft-cable to chan gc the direction of pull of the latter at any pointbetween its ends may be readily made by the removal of the key 13, whichwill permit the side plate 51 to be swung laterally and the yoke-bar 7rocked on the strap G, fixed on the side plate 5, which will freelyexpose the upper edge of the sheave l0 for the reception of the cable.(Not shown.)

As the split key13 may be quickly removed by pulling upon the chain 14,it will be evident that when this is done the release of the cable fromthe block may be expeditiously effected and the cable removed by simplypulling the block sidewise, so as to press the cable against thereleased side plate 5a, which will swing the latter outwardly into theposition represented in Fig. 3.

It will be seen that the position of the yokebar '7 and the securedpivotal attachment thereon of the side plates 5 5n by means of thestraps o' 6, having hinge-leaves G and the riveted pivots S, that engagesaid ears, together with the ends of the yoke-bar, aords a very reliablemeans for opening the block, as already described, this being onefeature of the improvement. Y

The provision of the removable headed pivot-bolt Il, which connects thesheave 10 with the side plate 5 in a manner that permits the freerotation of the sheave-wheel on said bolt-body, is another detail oftheinvention.

The provision of a shoulder a on the pivotbolt 11 at the base of thethread thereon and which seats upon the side plate 5 when the nut l2 isforcibly drawn against the strap 6 It will be seen that the formation ofthe angular head lln on the pivot-bolt Il and the engagement of saidhead by the side plate 5r and strap (S when the head is passed throughthe angular perforation in the plate and strap adapts the latter to holdthe pin from turning or becoming loose on the side plate 5.

In case the body of the pivot-bolt ll is rendered untrue where itis mostforcibly pressed upon by the sheave lO, which obviouslyris the side ofthe bolt nearest the yoke-bar 7, the pivot-bolt may be turned one-fourthof a revolution by applying a wrench to the head Il after slackening thenut l2, which will present a true surface of the bolt -body forengagement with the sheave at the point where the greatest wear is.

After the head 1l:l of the bolt is turned as described it will beadapted to receive the side plate 511 and the strap 6, having theangular perforation therethrough, and when so adjusted the bolt shouldbe firmly secured on the side plate 5 by a proper adjustment of the nut12.

It will be seen that as the head 1l of the bolt is four-sided it mayreceive three successive adjustments after wear on the pivot-bolt bodyrenders this change of position necessary. This provision is also anovel feature of the improved snatch-block.

Having thus described my invention, I `claim as new and desire to secureby Letters Patent l. In a tackle-block, the combination of a cheek-platemovable relatively to the swivelbar, a wheel rotatably secured thereto,and a second movable cheek-plate adapted to be brought into parallelismwith the wheel-carrying plate, the construction being such that the wheel will be interposed between the movable plates, substantially as setforth.

2. In a tackle-block, the combination of two cheek-plates, pivoted tobemovable outward relatively to the swivel-bar, a wheel carried by one ofsaid cheek-plates, and means for locking the plates in approximately aposition of parallelism, substantially as set forth.

3. In a tackle-block, the combination of a swiveled bar, a swingingcheek-plate pivoted Y to said bar, a wheel, a second swinging cheekplatepivoted to the swiveled bar, and means passing through the twocheek-plates and the wheel for locking said plates in parallelism andpermitting the wheel to be revolved between said plates, substantiallyas set forth.

4. In a tackle-block, the combination of a swiveled bar, twocheek-plates pivoted to said bar in such manner that the plates may bemoved outward relative to each other or ICO IIO

vanse' brought into parallelism, a grooved wheel, and a bolt passingthrough the cheek-plates and the wheel, the construction being such thatthe plate will be locked in parallelism and the grooved Wheel mayrevolve freely between said plates, substantially as set forth.

5. A tackle-block comprising two cheekplates, a strap on each of 4saidcheek-plates, a yoke-bar hinged by its ends on each strap, a swiveledeyebolt mounted on the yoke-bar, a pivotbolt securable on one of thecheek-plates and one of the straps, a sheave-wheel rotatable on thepivot-bolt, said bolt having an angular head adapted to pass through amating orifice in either cheek-plate and strap, and means fordetachablyholding said cheek-plate and strap folded over the end of thepivot-bolt, substantially as set forth.

6. A tackle-block comprising two cheekplates, a strap secured on eachcheek-plate, said straps having hinged leaves at their upper ends, ayoke-bar, the ends of the yolre-bar having hinged engagement with thestraps on the cheek-plates, a pivot-bolt threaded on one end andshouldered on said end, such end passing through a` perforation in oneof the cheek-plates and one of the straps, a bolt having an angularhead,the other cheek-plate and strap having a mating angular perforationwherein the bolt-head firmly fits, and means for holding the cheek-plateand strap folded ovei the bolt, substantially as set forth.

7. ln a device of the character described,the yole-bar, the cheek-platesand straps therein hinged upon the yoke-bar, the pivot-bolt held on oneof the cheek-plates by a nut, said bolt having a square head, the othercheek-plate and strap having a square opening wherein the head of thebolt loosely fits, and a split key adapted to pass through a transverseperforation in the head of the bolt for holding such cheek-plate uponsaid head.

8.' In a tackle-block, the combination of two cheek-plates, pivoted tobe movable outward a horizontally disposed, wheel supporting membercarried by one of said cheek-plates, a wheel carried by said member, andmeans engaging with the aforesaid member for locking the cheek-plates inapproximately a position of parallelism7 substantially as set forth.

9. In a tackle-block, the combination of a swiveled bar, a swingingcl1eekplate pivoted to said bar, a horizontally-disposedWheel-supporting member carried by the aforesaid cheek-plate, a secondswinging cheek-plate pivoted to the swiveled bar, and locking meanspassing through the wheel-supporting meinber adjacent to the outersurface of one of said cheek-plates for locking the said cheekplates inparallelism, substantially as set forth.

lO. ln a tackle-block, the combination of a swiveled bar, twocheek-plates pivoted to said bar in such manner that the plates may beswung outward relative to each other or brought into parallelism, a boltpassing through the cheek-plates, a grooved Wheel supported on said boltbetween the plates, an d a locking-pin adapted to pass through saidbolt, the construction being such that the plates will be locked inparallelism and the grooved wheels may revolve freely through saidplates, substantially as set forth.

ln testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS E. MADDUX.

lVitnesses: n

FRANK R. THOMSON, JNO. L. HALIHAN.

